Has GNOME rejected Canonical help?

Through the fall-out from the Unity decision, and now the fall-out from the packaging of Banshee on Natty, I have repeatedly read Canonical & Ubuntu people say “We offered our help to GNOME, and they didn’t want it”.

Exhibit #1:

For starters, some people in the GNOME community moan about how Ubuntu doesn’t pull its weight upstream.They then make it difficult for Ubuntu-y folks to contribute things upstream.